Choose the best answer:
I have known her _________ two years.

 

The ability to conduct electricity is one of the key properties of a metal. Other solid material such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what are known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together.

An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the 'lead' of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.

Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor or electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.

                                                                                                             By Helena Gillespie and Rob Gillespie, Science for Primary School Teacher. OUP

Electrical conductivity is________.

Read the following passage and choose the best answer (A, B, C, D):
Carbohydrates, which are sugars, are an essential part of a healthy diet. They provide the main source of energy for the body, and they also function to flavor and sweeten foods. Carbohydrates range from simple sugars like glucose to complex sugars such as amylose and amylopectin. Nutritionists estimate that carbohydrates should make up about one-fourth to one-fifth of a person's diet. This translates to about 75- 100 grams of carbohydrates per day. A diet that is deficient in carbohydrates can have an adverse effect on a person's health. When the body lacks a sufficient amount of carbohydrates it must then use its protein supplies for energy, a process called gluconeogenesis. This, however, results in a lack of necessary protein, and further health difficulties may occur. A lack of carbohydrates can also lead to ketosis, a buildup of ketones in the body that causes fatigue, lethargy, and bad breath.
7. What does the word "this" refer to?

Read the passage below carefully, and then choose the best answer:
Billboards that Recognize You
Have you ever felt you were being watched? Some new technologies might make you feel that way. Digital billboards are being created that have the ability to recognize certain characteristics. These high-tech devices have cameras pointed at the people on the street, and software that tries to recognize people by age and gender. A computer inside the billboard then uses this information to display ads that are directed at the people who are looking at the billboard. For example, if a man passes a billboard featuring an ad for cosmetics, the computer can change the ad to something that is more likely to catch the man’s attention, such as a restaurant, or sporting goods. While advertisers see this as a great opportunity to reach their target customers, some people feel that this kind of profiling is an invasion of their privacy. People are now much more aware of how information is exposed, shared, bought, and sold on the Internet. Now this debate will include technologies such as these “smart” billboards. But advertisers claim that they are sensitive to people’s concern about privacy – companies that have tested the billboards in Japan and the US assure consumers that the billboards can only guess your age and gender, but they will not be able to recognize your face or obtain any personal information about you. Until recently, this kind of “personal” advertising has been mostly limited to the Internet. Search engines like Google and Bing can follow what we search for because each computer that connects to those sites has a unique identity. Companies then pay search engines to use this information to display ads for products and services that you have searched for. So if you search for travel information, you are likely to see ads for airlines and hotels. This kind of advertising has proven to be much more effective and valuable than traditional advertising. In addition to taking steps to deliver more personalized messages, advertisers are using billboards to offer more useful information. Digital billboards can connect to the Internet to display information such as the time, weather, and news headlines. In the future, this technology could be used to reflect activity on social media sites or to broadcast ads that relate to local events. In today’s world, people ignore thousands of ads every day. Advertisers are trying to change that trend by personalizing the experience of seeing an ad. So pay attention the next time you see a billboard – it could be talking to you.
6. Because of advertising profiling, a person buying airline tickets online will _________.

His emotional problems  __________from the attitudes he encountered as a child, I think.

(110)______

Choose the best answer:
The ………… drink in Viet Nam is tea.

Find mistakes
 There are many different ways of comparing the culture of one nation with those of another.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Most journeys in Britain and the US are made by road. Some of these are made on public transport but most are by private car.
In Britain many people rely on their cars for daily local activities, e.g. getting to work, doing the shopping, and visiting friends. People living in urban areas may use buses, trains or, in London, the Underground, to get to city centres, mainly because traffic is often heavy and it is difficult to find anywhere to park a car. Some places in the country may have a bus only two or three times a week so people living there have no choice but to rely on their cars.
In the US large cities have good public transportation systems. The El railroad in Chicago and the underground systems of New York, Boston, San Francisco and Washington, DC are heavily used. Elsewhere, most Americans prefer to use their cars. Families often have two cars and, outside major cities, have to drive fairly long distances to schools, offices, shops, banks, etc. Many college and even high-school students have their own cars.
Long-distance travel in Britain is also mainly by road, though railways link most towns and cities. Most places are linked by motorways or other fast roads and many people prefer to drive at their own convenience rather than use a train, even though they may get stuck in a traffic jam. Long-distance coach/bus services are usually a cheaper alternative to trains, but they take longer and may be less comfortable. Some long-distance travel, especially that undertaken for business reasons, may be by air. There are regular flights between regional airports, as well as to and from London. A lot of freight is also distributed by road, though heavier items and raw materials often go by rail.
In the US much long-distance travel is by air. America has two main long-distance bus companies, Greyhound and Trailways. Amtrak, the national network, provides rail services for passengers. Private railway companies such as Union Pacific now carry only freight, though in fact over 70% of freight goes by road.
The main problems associated with road transport in both Britain and the US are traffic congestion and pollution. It is predicted that the number of cars on British roads will increase by a third within a few years, making both these problems worse. The British government would like more people to use public transport, but so far they have had little success in persuading people to give up their cars or to share rides with neighbours. Most people say that public transport is simply not good enough. Americans too have resisted government requests to share cars because it is less convenient and restricts their freedom. Petrol/gasoline is relatively cheap in the US and outside the major cities public transport is bad, so they see no reason to use their cars less.

 It is mentioned in paragraph 3 that the public transportation systems in the US are good in     .

William Sydney Porter (1862-1910), who wrote under the pseudonym of O. Henry, was born in North Carolina. His only formal education was to attend his Aunt Lina’s school until the age of fifteen, where he developed his lifelong love of books. By 1881 he was a licensed pharmacist. However, within a year, on the recommendation of a medical colleague of his Father’s, Porter moved to La Salle County in Texas for two years herding sheep. During this time, Webster’s Unabridged Dictionary was his constant companion, and Porter gained a knowledge of ranch life that he later incorporated into many of his short stories. He then moved to Austin for three years, and during this time the first recorded use of his pseudonym appeared, allegedly derived from his habit of calling “Oh, Henry” to a family cat. In 1887, Porter married Athol Estes. He worked as a draftsman, then as a bank teller for the First National Bank.

   In 1894 Porter founded his own humor weekly, the “Rolling Stone”, a venture that failed within a year, and later wrote a column for the Houston Daily Post. In the meantime, the First National Bank was examined, and the subsequent indictment of 1886 stated that Porter had embezzled funds. Porter then fled to New Orleans, and later to Honduras, leaving his wife and child in Austin. He returned in 1897 because of his wife’s continued ill-health, however she died six months later. Then, in 1898 Porter was found guilty and sentenced to five years imprisonment in Ohio. At the age of thirty five, he entered prison as a defeated man; he had lost his job, his home, his wife, and finally his freedom. He emerged from prison three years later, reborn as O. Henry, the pseudonym he now used to hide his true identity. He wrote at least twelve stories in jail, and after re-gaining his freedom, went to New York City, where he published more than 300 stories and gained fame as America’s favorite short Story writer. Porter married again in 1907, but after months of poor health, he died in New York City at the age of forty-eight in 1910. O. Henry’s stories have been translated all over the world.

(88)________

Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
The Prime Minister's comments yesterday on education spending miss the point, as the secondary education system also needs a major overhaul. Firstly, the system only views the weakest learners as having special (1)...... .The brightest and most (2)....... students are not encouraged to develop to their full potential. Secondly, there's too much testing and not enough learning. My fifteen-year-old daughter, for example, has just spent the last month or so (3)_____ for exams. These aren't even real, important exams, as her GCSEs will be next year. They're just (4)....  exams. Is the work she's been doing really going to make her more (5)..... about her subjects, or will she forget it all tomorrow? I suspect the latter. Thirdly, the standard (6)_____ doesn't give students any (7)....... in developing practical work-related, living and social skills, or in skills necessary for higher education. How many students entering university have the first idea what the difference is between (8)....... someone else's work and making good use of someone else's ideas? Shouldn't they have been taught this at school? How many of them are really able to go about (9).......a  skill that's essential at university because there are no teachers to tell you what to do - in an efficient way? Indeed, hoe many students (10)....... from university totally unable to spell even simple English words correctly? The system is letting our children down

Heis the man______ car was stolen last week.

(273)____

Choose the best answer:
He is too short to play basketball.

Choose the best answer:
Do you need to be that stressed______?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Glass is a remarkable substance made from the simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent, or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful. Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms - as table ware, containers, in architecture and design - glass represents a major achievement in the history of technological developments.
Since the Bronze Age about 3,000 B.C., glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass thus formed by melting then cools to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarily associated with that process. This is why glass shatters so easily when dealt a blow. Why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.
Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or "freeze" at specific temperatures glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.

What does the author imply about the raw materials used to make glass?

Read the passage below carefully, and then choose the best answer:
Space Debris
Once something is considered rubbish, we want to throw it away and forget about it. Yet if we are not careful about where we store it, our garbage could come back to haunt us. On the Earth, poorly discarded garbage can cause land, water, and air pollution. And now, people are starting to learn that space debris can also cause a host of different problems. Space debris is defined as a collection of objects that orbit the Earth. Space debris can be classified into two categories. One is man-made rubbish, such as old satellites, rockets, and other machinery left in space after past missions. The other is natural objects, such as meteors that are traveling through space. If you think the man-made garbage doesn’t amount to much, guess again. Researchers estimate that there are over 20,000 pieces of large debris floating around in space and approximately 300,000 smaller pieces in orbit as well. Traveling at speeds of up to 17,500 miles per hour, these objects create a great degree of danger for any spaceships when they leave or return to the Earth. We are lucky to some degree that there haven’t been too many accidents caused by space debris as of yet. Still some incidents have occurred. In 1996, a French satellite was damaged after it crashed into debris from an old French rocket. Then in 2009, an old Russian satellite collided with a working US satellite. The end result was an additional 2,000 pieces of space junk that was added to the junk pile. As the current situation can only worsen, it is now up to the international community to cooperate and create a plan to deal with space debris. For starters, several nations have pledged to take more care with the items they discard in space to cut down on future debris. Researchers are working on devising a way to label space junk, so it can be avoided. Others have proposed more creative techniques to recapture the garbage and discard it on the Earth, or destroy it with lasers. The nightmare scenario that everyone fears is if the Kessler Syndrome starts to occur. This is when the density of garbage becomes so high that it sets off a chain reaction of collisions which would raise the probability of accidents even further. Although there is not a long-term solution in place for space debris, nations are starting to understand the seriousness of this problem.
2. What makes up most of man-made space debris?

Choose the underlined words or phrases that are not correct in standard written English.
 Tom used to going to school by bus. Now he goes by bike.

Read an article about Elizabeth Taylor and choose the best answer.

Elizabeth Rosemond Taylor was born on February 27, 1932, in London, England. One of film's most celebrated stars, Elizabeth Taylor has fashioned a career that's covered more than six decades, accepting roles that have not only showcased her beauty, but her ability to take on emotionally charged characters.

Taylor's American parents, both art dealers, were residing in London when she was born. Soon after the outbreak of World War II, the Taylors returned to the United States and settled into their new life in Los Angeles.

Performance was in Taylor's blood. Her mother had worked as an actress until she married. At the age of 3, the young Taylor started dancing, and eventually gave a recital for Princesses Elizabeth and Margaret. Not long after relocating to California a family friend suggested the Taylors' daughter take a screen test.

She soon signed a contract with Universal Studios, and made her screen debut at the age of 10 in There's One Born Every Minute (1942). She followed that up with a bigger role in Lassie Come Home (1943) and later The White Cliffs of Dover (1944).

Her breakout role, however, came in 1944 with National Velvet, in a role Elizabeth Taylor spent four months working to get. The film subsequently turned out to be a huge hit that pulled in more than $4 million and made the 12-year-old actress a huge star.

Taylor _________________________.

Read the passage below carefully, and then choose the best answer:
Microtrends: It’s a Small World After All
In today’s world, it seems like everyone is focused on “the big picture”. However, coming up with large-scale solutions is not always what is needed. Sometimes it pays to think small – and that is exactly what many people are doing these days. By thinking small, lots of big minds have created some pretty amazing things. One example of this is microloans. Microloans are tiny loans, in some cases just a few dollars, which are available to people in developing countries. Although this may not seem like a lot of money, microloans can help workers to escape poverty and start their own businesses. The person behind the modern microloan movement is a Bangladeshi man named Muhammad Yunus. He started the project in the 1970s by offering villagers low-interest loans using his own money. Yunus wanted to offer poor people access to small loans so they wouldn’t be forced to turn to gangsters if they needed funds. In 1983, he founded the Grameen Bank and soon after, similar organizations started popping up around the globe. Although there are still some issues with microloans, at the very least they offer everyone the potential of becoming an entrepreneur. For most of the 20th century, companies required large sums of money and plenty of manpower to compete at the highest levels. In the late 1990s, the Internet changed this and many microenterprises came about. Microenterprises are smaller companies that employ less than 10 people and only require small sums of money to start. Being small offers lots of flexibility to these companies as they can react more quickly than corporate giants when a business opportunity arises. Many technology companies that produce mobile apps and websites fall into this category. Keep in mind that having a small staff doesn’t mean small profits, as microenterprises can earn hundreds of millions of dollars per year. Thinking small can also lead to a tremendous improvement in quality. One example of this is microbreweries, which are smaller-sized breweries that produce far less beer than traditional breweries. Since microbreweries don’t have to target large markets and make millions of sales to stay open, they can monitor the brewing process carefully to make sure everything is perfect. In addition, microbreweries can experiment with unique flavours that many traditional brewers would shy away from. So the next time you are asked to “think big”, remember that good things may also come in small packages.
1. According to the passage, who are microloans supposed to help?

Rewrite the sentence:
No mount in the world is higher than Mount Everest.

Rewrite sentences without changing the meaning
People use a lot of vehicles. The air is polluted.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions :
The oceans of the world are precious because of (1)_________ they do for all life on the Earth. They help regulate the temperature of the planet and they are home to a myriad of sea creatures – many of which we depend on (2)________ sources of food. However, due to our consumption and improper disposal of plastic items, human beings have created a swirling mess of garbage. The one located in the Pacific now known as the Great Pacific Garbage Patch, and it is not a pretty sight. In an ideal world, all of the plastic would be recycled and there would be zero waste. This is not the case, however, and a huge amount of the plastic ends up making its (3)_________ to our oceans due to carelessness. (4)__________ the plastic is part of rain runoff coming from a landfill or just a thoughtless discard of a piece of plastic onto the ground, if it ends up in the Pacific Ocean, it will eventually become part of the disgusting patch of garbage. The Great Pacific Garbage Patch may be impossible to (5)__________ but it is doing a lot of harm to sea life. If anything, we can do our best to avoid over-using plastic